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Turbine cooling Airflow:
Figure illustrates the turbine cooling airflow of a typical gas turbine engine. The outward flow of cooling air is controlled by air seals of multi-groove construction and the arrangement is such that the turbine discs obtain the maximum possible cooling from the airflow. Interstage seals are incorporated and they are made in such a way that the front sections provide less restriction to the passage of air than the rear sections do. The result is that the rate at which the cooling air flows across the seals is sufficient to prevent any inward flow of hot gases. The front face of each disc receives a greater airflow than the rear.
High pressure cooling air is also directed to the engine's nozzle guide vanes and turbine blades. These components, which are externally heated by the high temperature gas stream, are cooled by ducting air through air passages formed inside the items themselves. After completing its task, the air is exhausted into the engine exhaust gas flow and thence to atmosphere.
Method of calculating the thrust forces: The thrust forces or gas loads can be calculated for the engine, or for any flow section of the engine, provided that the areas, pressu
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Framework In the laboratory we will deal with low speed flows, at first using the potential flow solver. We will also investigate behaviour for the NACA 4-series of aerofoils.
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